11 24 571 Replacing all connecting rod bearings (N63 O1)

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Special tools required:

00 2 590 .
00 9 120 .

IMPORTANT: Note GRINDING STAGES ON CRANKSHAFT .

Necessary preliminary work:

Remove all PISTONS .

Install new connecting rod bearing shells.

Install one blue bearing shell (1) and one red bearing shell (2) in each connecting rod.

Graphic N63.

Fig 1: Identifying Blue Bearing Shell And Red Bearing Shell

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Installation note:

The bearing shells on the connecting rod are coded.

Connecting rod bearing cap (1): the red bearing shell is engaged and the fastening notches are on the left and right sides of the bearing shell (see arrows).

Connecting rod (2): the blue bearing shell is fitted and the fastening notches are one side of the bearing shell (see arrows).

Fig 2: Locating Fastening Notches On Bearing Shells

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IMPORTANT: New connecting rods must be vacuum cleaned prior to installation.
Do not use compressed air to blow off cracked areas.

Use a commercially available vacuum cleaner (2) to vacuum clean cracked areas (1).

Fig 3: Cleaning Cracked Areas

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Check connecting-rod bearing play .

Piston in BDC position.

Fit special tool 00 2 590 (Plastigage type PG 1) to oil-free crankshaft.

Fit bearing caps so that matching numbers match up.

Fig 4: Installing Special Tool (00 2 590) To Oil-Free Crankshaft

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IMPORTANT: Do not turn connecting rod and crankshaft (2).

Use connecting rod bolts (1) to check connecting-rod bearing play.

Secure connecting rod bolts (1) with special tool 00 9 120 .

Tightening torque 11 24 1AZ .

Note the pairing letters (3).

Fig 5: Identifying Connecting Rod Bolts, Crankshaft, And Pairing Letters

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Remove bearing cap and read off radial clearance at width of crushed plastigage with assistance of measuring scale.

CONNECTING-ROD BEARING PLAY .

Remove Plastigage.
Lubricate crankshaft and bearing shells.
Install new connecting rod bolts.

Fig 6: Measuring Radial Clearance
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Secure connecting rod bolts with special tool 00 9 120 .

Tightening torque 11 24 1AZ .

Graphic N63.

Fig 7: Securing Connecting Rod Bolts Using Special Tool (00 9 120)

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Assemble engine.